48-year-old retired teacher Mike Cronk was immediately aware of what was going on when he heard bullets hitting a nearby fence. His senses heightened even further when his 52-year-old best friend, Rob MacIntosh, was shot 3 times. "I saw him there and I wasn't going to leave him," Cronk told ABC News. With the help of some EMTs and ex-military members, he successfully moved Rob under the concert stage, and stabilized him by compressing his wounds with his own shirt. Cronk then went on to help load other injured people into an ambulance, one of whom tragically died in his arms. "It could have been me that got shot. So many people... very thankful right now."